fix usage output formatting
diff --git a/index.js b/index.js
index 57ec503..f277930 100644
--- a/index.js
+++ b/index.js
@@ -150,7 +150,7 @@
         alias: "condition",
         type: "string",
         group: "Agent options:",
-        describe: "Hit condition to trigger debugger. Javascript expression evaluated against input parameters. Example: 'debug == 'true'"
+        describe: "Hit condition to trigger debugger. Javascript expression evaluated against input parameters. Example: `debug == 'true'`"
     });
     yargs.option("agent-timeout", {
         type: "number",